标签：语句 username none 判断 变量 vars defined when
| 参数 |
释义 |
示例 |
| defined |
变量已定义 |
when: username is defined |
| undefind |
变量未定义 |
when: username is undfined |
| none |
变量已定义未赋值 |
when: username is none |
- hosts: all
tasks:
- name: test defined
vars:
username: test1
debug:
msg: "{{ username }} is defined"
when: username is defined
- name: test undefined
vars:
debug:
msg: "username is undefined"
when: username is undefined
- name: test none
vars:
username:
debug:
msg: "{{username}} is none"
when: username is none
标签：语句,
username,
none,
判断,
变量,
vars,
defined,
when
From： https://www.cnblogs.com/wangend/p/17066004.html